本期内容：

For the first time a computer beat a world champion at the Asian board game of Go. Google’s DeepMind AlphaGo defeated Lee Se-dol of South Korea in the first two encounters of a best-of-five series. The third game is due to take place today. Computers had already beaten the world’s best chess players, but Go is much more complex.

词义解析:

Encounter：对决
Best-of-five: 五局三胜
Go: 围棋